Foldable stretcher



FIG. 1 is a perspective view of the foldable stretcher according to my new ornamental design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right-hand side view thereof;

FIG. 5 is a left-hand side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line showing is included for the purpose of illustrating part of the foldable stretcher that forms no part of the claimed design. 

CLAIM The ornamental design for a foldable stretcher, as shown and described. 